package com.TTotal;

import common.ListNode;

public class TTotal {

    public static ListNode sumTwoNum(ListNode l1, ListNode l2) {
        ListNode pre = new ListNode(0);
        ListNode cur = pre;
        int carry = 0;

        while (l1 != null || l2 != null) {
            int a = l1 == null ? 0 : l1.val;
            int b = l2 == null ? 0 : l2.val;
            int sum = a + b + carry;

            carry = sum / 10;
            cur.next = new ListNode(sum % 10);
            cur = cur.next;

            if (l1 != null) l1 = l1.next;
            if (l2 != null) l2 = l2.next;
        }
        if (carry == 1) cur.next = new ListNode(carry);
        return pre.next;
    }
}
